`BookProof.ChapterGravityProjDirectSum.range_spatial_eq_ker_time` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : LinearMap.range (spatialProj v).mulVecLin = LinearMap.ker (timeProj v).mulV

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`BookProof.ChapterGravityProjDirectSum.range_spatial_eq_ker_time` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : LinearMap.range (spatialProj v).mulVecLin = LinearMap.ker (timeProj v).mulV · Prove2Me